Finishing design to increase the polymer content in an...

C - Chemistry – Metallurgy – 08 – F

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C08F 6/10 (2006.01) C08F 2/04 (2006.01) C08F 10/02 (2006.01)

Patent

CA 2315753

The polymer recovery capacity of solution polymerization units is increased by flashing a polymer solution exiting olefin polymerization reactors to produce a concentrated polymer solution having a reduced temperature and a solids content from 10 percent to 40 percent by weight. Flashing of the polymer solution preferably occurs at a temperature at least 20 °C higher than the crystallization temperature of the concentrated polymer solution. The concentrated polymer solution can be prepared adiabatically and can be subsequently finished in conventional polymer recovery units without increasing the risk of gel formation.

On accroît la capacité de récupération de polymère d'unités de polymérisation en solution en soumettant à une vaporisation instantanée une solution de polymère en provenance de réacteurs de polymérisation d'oléfines de manière à produire une solution de polymère concentrée à une température réduite et à teneur en particules solides comprise entre 10 et 40 % en poids. La vaporisation instantanée de la solution de polymère se déroule de préférence à une température supérieure d'au moins 20 degrés Celsius à la température de cristallisation de la solution de polymère concentrée. Ladite solution de polymère concentrée peut être préparée adiabatiquement, puis subir une étape de finition dans des unités de récupération de polymère classique sans accroissement du risque de formation de gel.

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